JP3101659U - Magnetic tape unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic tape device capable of reducing the number of parts of a bearing portion of a capstan motor, thereby reducing the cost and the number of steps, while ensuring the rotation sliding of a shaft and preventing the impregnating oil from scattering. It is to be.
A capstan motor includes a shaft, a pulley and a rotor yoke fixed to the shaft, a permanent magnet fixed to the rotor yoke, a stator yoke, and a stator. A plurality of stator windings 16 fixed to the yoke 15; a bearing housing 17 fixed to the stator yoke 15; bearings 18 and 18 'provided at both ends of the bearing housing 17 for supporting the shaft 11; Fixed to the outer periphery of the bearing 18
And a retaining washer 20 that forms a sliding surface with the bearing 1.
8 has a concave portion on its sliding surface and is embedded in the bearing housing 17 by 0.5 mm or more.
[Selection diagram] Fig. 1

Description

The present invention relates to a magnetic tape device, and more particularly, to a structure of a capstan motor of the magnetic tape device.

The magnetic tape device is provided with a capstan motor for winding the tape. FIG. 3 is a cross-sectional view of a conventional VTR capstan motor 21, and FIG. 4 is an enlarged view of a main part of FIG. 11 is a shaft, 12 is a pulley, 13 is a rotor yoke, 14 is an annular permanent magnet, 15 is a stator yoke formed of a magnetic thin plate, 16 is a stator winding formed in a flat shape, and 17 is a bearing housing. Reference numerals 18 and 18 'denote oil-impregnated bearings made of sintered metal, 19 denotes a thrust receiver, and 22 denotes an oil drain.

A plurality of flat stator windings 16 are arranged and fixed in an annular shape around the shaft 11 on the stator yoke 15, and an oil-impregnated bearing 18 is mounted on a bearing housing 17 to which the stator yoke 15 is fixed. , 18 'and a thrust receiver 19 are mounted. And the oil-impregnated bearings 18, 1
A rotor yoke 13 is fixed to the shaft 11 supported by 8 ′, and a permanent magnet 14 is fixed to the rotor yoke 13 in contact with the rotor yoke 13, and the permanent magnet 14 is disposed to face the stator winding 16 via a gap. I have. The oil drain 22 is fitted into the shaft 11 and slides on the surface of the thrust receiver 19.

The structure of the shaft 11 and the bearing housing 17 is such that the long shaft 11 is supported by the oil-impregnated bearings 18, 18 ′, and the shaft 11 appearing on the oil-impregnated bearing 18 is used as a capstan shaft of the VTR.

Patent Document 1 discloses a thrust bearing for a motor including the above configuration. Oil drainer 22
Also plays a role of preventing the shaft 11 from coming off, thereby reducing the number of parts and the cost.
JP-A-9-182356

The above conventional capstan motor is provided with oil-impregnated bearings 18 at both ends of a bearing housing 17 in order to prevent a long shaft serving as a capstan shaft from being bent by a pressing force of a pinch roller (not shown).
, 18 '. However, there are many components for stabilizing the rotation and sliding of the shaft 11 and for preventing the impregnating oil from scattering, which increases the cost and increases the number of assembly steps. Although the number of components is reduced by one in Patent Document 1, it can be said that there are still many components.

The present invention provides a magnetic tape device that realizes a reduction in cost and the number of processes by reducing the number of parts of a bearing portion of a capstan motor while securing stabilization of rotational sliding of a shaft and prevention of scattering of impregnating oil. The purpose is to provide.

In order to achieve the above object, the present invention provides a shaft serving as a capstan shaft, a pulley and a rotor yoke fixed to the shaft, an annular permanent magnet fixed to the rotor yoke, and a magnetic thin plate. A stator yoke formed; a plurality of stator windings fixed to the stator yoke so as to face the permanent magnet; a bearing housing fixed to the stator yoke; and a bearing housing. In a magnetic tape device equipped with a capstan motor having a plurality of bearings for supporting the shaft, a sliding surface is fixed to an outer periphery of the shaft, and a sliding surface with a bearing near a side where the shaft protrudes and is pressed by a pinch roller. A magnetic tape device comprising: a retaining washer having:

With this configuration, it is possible to reduce the number of components of the bearing portion of the capstan motor, thereby realizing cost and number of steps.

Preferably, a concave portion is formed on a sliding surface of the retaining washer with the bearing.

With this configuration, the sliding area between the retaining washer and the bearing is reduced, and the sliding noise can be reduced. Further, since the impregnating oil accumulates in the concave portions, wear can be reduced.

Further, it is preferable that a part of the retaining washer is embedded in the bearing housing.

According to this configuration, the impregnating oil can be stored in a space surrounded by the side surface of the retaining washer and the inner surface of the bearing housing, and the effect of preventing the impregnating oil from scattering at the time of high rotation of the shaft is improved.

Furthermore, durability can be improved by using polyacetal as the material of the retaining washer instead of 6-nylon which has been conventionally used.

According to the present invention, there is further provided a shaft serving as a capstan shaft, a pulley fixed to the shaft, applying a rubber to a groove to transmit rotation to a reel base for driving a tape, and a rotor yoke fixed to the shaft. An annular permanent magnet fixed to the rotor yoke, a stator yoke formed of a magnetic thin plate, and a plurality of stator windings fixed to the stator yoke so as to face the permanent magnet. And a bearing housing fixed to the stator yoke, and a magnetic tape device equipped with a capstan motor including bearings provided at both ends of the bearing housing and supporting the shaft, the magnetic tape device being fixed to the outer periphery of the shaft, The shaft has a sliding surface with a bearing in the vicinity of a side where the shaft protrudes and is pressed by a pinch roller, and a retaining washer made of polyacetal is provided. Stop washer has a recess on the sliding surface of said bearing,
It is characterized by being embedded in the bearing housing by 0.5 mm or more.

By burying the retaining washer in the bearing housing at least 0.5 mm in this manner, the impregnating oil can be sufficiently accumulated in the space surrounded by the side surface of the retaining washer and the inner surface of the bearing housing, and the high rotation of the shaft can be achieved. The effect of preventing the impregnating oil from scattering at the time is improved.

According to the present invention, by providing a retaining washer that has both functions of a thrust receiver and an oil drainer of the conventional product, the rotation of the shaft is stabilized and the impregnating oil is prevented from being scattered. It is possible to provide a magnetic tape device that reduces the number of parts of the bearing portion and reduces the cost and the number of steps.

FIG. 1 is a sectional view of a capstan motor 10 for a VTR, and FIG. 2 is an enlarged view of a main part of FIG. The same components as those of the conventional capstan motor shown in FIGS. 3 and 4 are denoted by the same reference numerals. The capstan motor 10 includes a shaft 11 serving as a capstan shaft, a pulley 12 fixed to the shaft 11, for transmitting rotation to a tape drive reel base (not shown) by applying rubber to a groove, and a shaft 11. A rotor yoke 13 fixed to the rotor, an annular permanent magnet 14 fixed to the rotor yoke 13, a stator yoke 15 formed of a magnetic thin plate, and a permanent magnet 14.
, A plurality of stator windings 16 fixed to the stator yoke 15, a bearing housing 17 fixed to the stator yoke 15, and bearings 18 provided at both ends of the bearing housing 17 to support the shaft 11. , 18 ′ and a retaining washer 20 fixed to the outer periphery of the shaft 11 and having a sliding surface with the bearing 18 near the side where the shaft 11 protrudes and is pressed by a pinch roller (not shown). And this capstan motor 10 is a magnetic tape device (
(Not shown).

The retaining washer 20 has a sliding surface with the bearing 18.
Does not contact the bearing housing 17. If the retaining washer 20 has a sliding surface with the bearing housing 17, the frictional resistance is greater than in the present embodiment, the wear is severe, and the durability remains uneasy. In addition, current consumption and sliding noise increase.

A recess 20 a is formed on the sliding surface of the retaining washer 20 with the bearing 18. The concave portion 20a may be formed on the sliding surface with the bearing 18, and may be formed along the inner end of the bottom surface of the retaining washer 20 as shown in FIG. Or you can. Thereby, the sliding area between the retaining washer 20 and the bearing 18 is reduced, and the sliding noise can be reduced. Further, since the impregnating oil accumulates in the recess 20a, wear can be reduced. The function as a bearing can be achieved without the concave portion 20a.

Part of the retaining washer 20 is embedded in the bearing housing 17. It is desirable to bury it 0.5 mm or more from the viewpoint of preventing the impregnating oil from scattering. Thereby, the impregnating oil can be sufficiently stored in a space surrounded by the side surface of the retaining washer 20 and the inner surface of the bearing housing 17.
The effect of preventing the impregnating oil from scattering at the time of high rotation of the shaft 11 is improved.

As described above, the retaining washer 20 has both functions of the conventional thrust receiver 19 and the oil drain 22. Therefore, the number of parts can be reduced as compared with the related art, and the cost and the number of steps can be reduced.

As the material of the retaining washer 20, a durable polyacetal-based material can be suitably used instead of 6-nylon, which is generally used for the conventional oil drainer 22.

Here, a sintered metal made of an alloy of copper and iron or the like can be used for the bearings 18 and 18 '. The bearing housing 17 can be made of a material obtained by mixing fibrous glass with polycarbonate or a material obtained by mixing plate glass with polycarbonate.

The impregnating oil used for the bearings 18 and 18 'preferably has a viscosity of 200 cst or more from the viewpoint of preventing scattering.

INDUSTRIAL APPLICABILITY The magnetic tape device of the present invention can be used for a device on which a capstan motor is mounted, such as a reproducing device for a video tape or a cassette tape.

FIG. 4 is a sectional view of the VTR capstan motor of the present invention. It is a principal part enlarged view of FIG. It is sectional drawing of the conventional capstan motor for VTRs. It is a principal part enlarged view of FIG.

Explanation of reference numerals

10, 21 Capstan motor 11 Shaft 12 Pulley 13 Rotor yoke 14 Permanent magnet 15 Stator yoke 16 Stator winding 17 Bearing housing 18, 18 'Bearing 19 Thrust receiver 20 Retainer washer 22 Oil drain

Claims (5)

A shaft serving as a capstan shaft, a pulley fixed to the shaft, for transmitting rotation to a tape drive reel base by applying rubber to a groove, a rotor yoke fixed to the shaft, and the rotor An annular permanent magnet fixed to a yoke, a stator yoke formed of a magnetic thin plate, a plurality of stator windings fixed to the stator yoke so as to face the permanent magnet, In a magnetic tape device equipped with a capstan motor having a bearing housing fixed to a yoke and bearings provided at both ends of the bearing housing and supporting the shaft,
Fixed to the outer periphery of the shaft, has a sliding surface with the bearing near the side where the shaft protrudes and is pressed against the pinch roller, provided with a retaining washer made of polyacetal,
The magnetic tape device, wherein the retaining washer has a concave portion on a sliding surface with the bearing, and is embedded in the bearing housing by 0.5 mm or more. A shaft serving as a capstan shaft, a pulley and a rotor yoke fixed to the shaft, an annular permanent magnet fixed to the rotor yoke, a stator yoke formed of a magnetic thin plate, and the permanent magnet A plurality of stator windings fixed to the stator yoke so as to face the bearing, a bearing housing fixed to the stator yoke, and a plurality of bearings provided on the bearing housing and supporting the shaft. In a magnetic tape device equipped with a capstan motor,
A magnetic tape device, comprising: a retaining washer fixed to an outer periphery of the shaft and having a sliding surface with a bearing near a side where the shaft protrudes and is pressed by a pinch roller. 3. The magnetic tape device according to claim 2, wherein a recess is formed in a sliding surface of the retaining washer with the bearing. 4. The magnetic tape device according to claim 2, wherein a part of the retaining washer is embedded in the bearing housing. The magnetic tape device according to claim 2, wherein the retaining washer is made of polyacetal.

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